Ruthenium GUI Kit FREE PSD
This is a free PSD of huge Ruthenium GUI Kit. It includes some objects for interface design. Get free OpenSans font for using this PSD here:
Full version of Ruthenium GUI Kit includes over 200 objects. 
It’s an ultimate collection of GUI objects for desktop / mobile apps and web design. This huge set includes generic and really unique controls for any kind of applications and websites.
Features of FULL version 

* Both 72 and 326 ppi resolutions (Ready for desktop apps and for iPhone/iPad & Android/WP8 HDPI) 
* 100% Vector Shapes or Smart Objects (for photos and some objects) 
* Good named layers and organized layer sets 
* Easy to find, transform and re-color layers 
* Free font: Open Sans 
* Photos from Envato Assets Library only used 
* Compatible with Photoshop CS3 , CS4 & CS5; best for CS6 
* Layer styles file (.ASL) included
You can get full version of Ruthenium GUI Kit here
Also take a look at 4 volumes of Knóbz UI Kit here 
And 5th Volume of Knóbz just released
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